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D. J. QROURKE.

PISTON ROD PROTECTOR.

APPLICATION FILED SEPT-27, 191:.

Patented Aug. 1, 1916.

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DANIEL J'. OROURKE, 0F CLAREMONT, NEW HAMPSHIRE, ASSIGNOR, BY MESNE ASSIGNMENTS, T0 SULLIVAN MACHINERY COMPANY, OF BOSTON, MASSACHU- SETTS, A' CORPORATION OF MASSACHUSETTS. 1

PISTON-ROD PROTECTOR.

Specification of Letters Patent.

Patented Aug. 1, 1916.

To all whom it may concern:

Be it known that I, DANin'L J. ORoURKn, a citizen of the United States, and a resident of Claremont, county of Sullivan, and State of New Hampshire, (whose post-oiiice address is care of Sullivan Machinery Company, 50 Church street, New York, N. Y.,) have invented an Improvement in Piston- Rod Protectors, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to rock drills and particularly to means for removing the grit or dirt from the piston rod of such a drill and preventing it from entering the cylinder head and wearing the piston rod guides.

The invention will be best understood by reference to the following description when taken in connection with the accompanying illustration of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

In the drawings: Figure 1 shows a rock drill having applied theretoone embodiment of the invention; Fig. 2 is an end view on an enlarged scale of the holder for the wiping material; and Fig. 3 is a side elevation of the same.

Referring to the drawings and to the embodiment of my invention, I have therein shown for purposes of illustration a usual or conventional form of pressure fluid actuated rock drill having the cylinder 1, the piston 2, and piston rod 3. The end of the piston rod has secured thereto a tool holder chuck 4: to receive the drill steel not herein shown. The forward end of the cylinder is provided with a piston rod guide which, as is usual in this class of devices comprises a split or other form of bushing 5 with which the piston rod has sliding engage ment. The bushing provides a prolonged guide for the piston rod andassists in maintaining it in the required alinement. The

' become worn through the dirt and grit in the form of pulverized rock dust which rises from the drilled hole and which is carried into the bearing on the surface of the piston rod. This destroys the fit between the rod and its guide and materially decreases the efliciency and effectiveness of the drill.

To prevent the admission of grit to the bushing and thereby to prolong its life and preserve the alinement of the reciprocating elements of the drill, I have herein provided means for removing the grit by automatically wiping the rod as the latter retracts or Withdraws into the bushing. For this purpose the bushing 5 is prolonged so as to project below the retaining head or shell 6 and the projecting portion is provided with a groove in which is seated the ring-like wall 8 of a cup or retainer adapted to hold wiping material 9 such as cotton waste or the like in a position to embrace the piston rod and cause the dirt and grit to be wiped therefrom. The wiping material 9 is herein retained by means of bent fingers or prongs 10 which, project from the ring-like wall 8 and are bent or curved to hold-the wiping material in place. Obviously, however, any desired formation may be employed To apply the holder to the bushing the rim 8 is split so that it may be spread open and slipped over the chuck 4 and the end of the bushing and seated in the groove. When seated it is clamped into position by means of the clamping bolt 11. If desired the holder may be stamped or otherwise formed out of relatively thin sheet metal and then rolled up into the shape shown or it may be cast or otherwise formed of relatively heavier metal, and if the latter, may, if desired, be split into halves and clamped together by two diametrically opposite bolts.

A wiper holder constructed as described is adapted to hold the waste or other wiping material at the end of the bushing and in the best position to protect the bushing from the action of the rock dust and grit.

While I have herein shown and described for purposes of illustration one specific embodiment of the invention it is to be understood that the same may be varied Within a about the bushing 2. In a piston rod sWab, the combination with a cylinder of a piston and piston rod, a guide bushing for the piston rod projecting from the end of the cylinder, a piston rod Wiping device including a plurality of separated holding members for holding Wiping material, and means for securing them to the end of the bushing to present prior to circle the rod, and a plurality of holding fingers projecting from the opposite end of the ring member and adapted to hold the Wiping material about the rod.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

DANIEL J. OROURKE.

Witnesses:

"ARTHUR HOFFMAN,

J 0s. H. BROWN, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D, G. p 

